bornhack-website/src/program/mixins.py

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from django.views.generic.detail import SingleObjectMixin
from django.shortcuts import redirect
from django.urls import reverse
from . import models
from django.contrib import messages
import sys, mimetypes
from django.http import Http404, HttpResponse
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class EnsureCFSOpenMixin(SingleObjectMixin):
def dispatch(self, request, *args, **kwargs):
# do not permit editing if call for speakers is not open
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if not self.camp.call_for_speakers_open:
messages.error(request, "The Call for Speakers is not open.")
return redirect(reverse('proposal_list', kwargs={'camp_slug': self.camp.slug}))
# alright, continue with the request
return super().dispatch(request, *args, **kwargs)
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class CreateProposalMixin(SingleObjectMixin):
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def form_valid(self, form):
# set camp and user before saving
form.instance.camp = self.camp
form.instance.user = self.request.user
speaker = form.save()
return redirect(reverse('proposal_list', kwargs={'camp_slug': self.camp.slug}))
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class EnsureUnapprovedProposalMixin(SingleObjectMixin):
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def dispatch(self, request, *args, **kwargs):
# do not permit editing if the proposal is already approved
if self.get_object().proposal_status == models.UserSubmittedModel.PROPOSAL_APPROVED:
messages.error(request, "This proposal has already been approved. Please contact the organisers if you need to modify something.")
return redirect(reverse('proposal_list', kwargs={'camp_slug': self.camp.slug}))
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# alright, continue with the request
return super().dispatch(request, *args, **kwargs)
class EnsureWritableCampMixin(SingleObjectMixin):
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def dispatch(self, request, *args, **kwargs):
# do not permit view if camp is in readonly mode
if self.camp.read_only:
messages.error(request, "No thanks")
return redirect(reverse('proposal_list', kwargs={'camp_slug': self.camp.slug}))
# alright, continue with the request
return super().dispatch(request, *args, **kwargs)
class EnsureUserOwnsProposalMixin(SingleObjectMixin):
def dispatch(self, request, *args, **kwargs):
# make sure that this proposal belongs to the logged in user
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if self.get_object().user.username != request.user.username:
messages.error(request, "No thanks")
return redirect(reverse('proposal_list', kwargs={'camp_slug': self.camp.slug}))
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# alright, continue with the request
return super().dispatch(request, *args, **kwargs)
class PictureViewMixin(SingleObjectMixin):
def dispatch(self, request, *args, **kwargs):
# do we have the requested picture?
if kwargs['picture'] == 'thumbnail':
if self.get_object().picture_small:
self.picture = self.get_object().picture_small
else:
raise Http404()
elif kwargs['picture'] == 'large':
if self.get_object().picture_large:
self.picture = self.get_object().picture_large
else:
raise Http404()
else:
# only 'thumbnail' and 'large' pictures supported
raise Http404()
# alright, continue with the request
return super().dispatch(request, *args, **kwargs)
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def get_picture_response(self, path):
if 'runserver' in sys.argv or 'runserver_plus' in sys.argv:
# this is a local devserver situation, guess mimetype from extension and return picture directly
response = HttpResponse(self.picture, content_type=mimetypes.types_map[".%s" % self.picture.name.split(".")[-1]])
else:
# make nginx serve the picture using X-Accel-Redirect
# (this works for nginx only, other webservers use x-sendfile)
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# TODO: maybe make the header name configurable
response = HttpResponse()
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response['X-Accel-Redirect'] = path
response['Content-Type'] = ''
return response